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What is a photo diode? In which mode of ...

What is a photo diode? In which mode of biasing does it work?

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Photodiode : These are p-n diodes, in which electron and hole pairs are created by junction photoelectric effect.
That is the covalent bonds are broken by the radiations (light) absorbed by the electron in the valence band.
The photodiode can be used for detecting light signals
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